During this period the placenta, the organ that transmits nutrients from the mother to the baby, develops.
A primitive form of the face develops during this phase with dark circles for eyes. Baby’s mouth, lower jaw and throat also take shape during this time.
Blood cells get formed and allow circulation to begin.
By the end of first month, the baby is about 6-7mm long.
Facial features continue to grow. A small fold of the skin appears on either side of the head which become ears. Little buds emerge to become arms and legs at a later phase. Fingers, toes, and eyes begin to form during the second month.
The neural tube is well formed. The digestive tract and sensory organs show signs of growth. Bone begins to replace cartilage. The embryo also begins to move but the mother cannot feel it just yet.
By the end of second month, the embryo becomes a foetus and is almost 2.5 cm long and weighs about 9.4 grams.
Towards the end of this month the baby is fully formed with arms, hands, fingers, feet, and toes. The baby can also open and close its fists and mouth. Nails tend to develop and the ears get form. Your baby's reproductive organs also develop. The circulatory and urinary systems are working and the liver starts to produce bile.
By this time, the baby is about 7 - 10 cm long and weighs about 28 grams.
In the second trimester of pregnancy, fingers and toes are fully developed. The eyelids, eyebrows, eyelashes, nails, and hair form, and teeth and bones are becoming denser. The baby can suck thumb, yawn, stretch, and even make faces.
The nervous system is beginning to function at this point in pregnancy. The reproductive organs and genitalia are now fully developed. The baby's heartbeat may now be audible through Doppler.
The baby is now about 6 inches and weighs almost 4 ounces.
Hair begins to grow on baby's head. The baby's skin is covered with a coating known as vernix caseosa. This is shed just prior to birth. The mother is likely to feel the baby’s movements during this phase.
By the end of the 5th month, the baby is 10 inches long and weighs from 1/2 to 1 pound.
The baby’s skin is red & wrinkled. Veins become visible through the skin. The eyelids begin to part and the eyes open. The baby is likely to respond to sounds through movements.
The baby now weighs about 2 pounds and is 12 inches long.
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During this month, fat begins to be deposited on your baby. The baby's hearing is fully developed. The baby may also respond to stimuli such as sound, pain, and light.
The baby is nearly 14 inches long and could weigh from about two to four pounds.
Baby continues to grow and have body fat reserves. The mother may feel more ‘kicks’ during this phase. The brain is develops at a fast phase, and the baby can clearly see and hear. Most internal systems are formed, but the lungs are not fully grown.
The baby is now about 18 inches long and weighs as much as about five pounds.
Towards the end of the third trimester, the baby continues to mature. The lungs are almost fully developed. Your baby's reflexes are coordinated and can blink, shut the eyes, turn the head, grasp, and also react to sounds, light, and touch.
The baby's position changes to get ready for the delivery.
By this time, the baby is about 18 to 20 inches long and weighs about seven pounds.